Practical covert quantum key distribution with decoy-state method
Practical covert quantum key distribution with decoy-state method
复制标题
使用诱饵态方法进行实用的隐蔽量子密钥分配
DOI：
10.1007/s11128-019-2181-1
复制
发表时间：
2019
影响因子：
2.5
通讯作者：
Wen Qiao-Yan
中科院分区：
文献类型：
--
作者：
Guo Fen-Zhuo;Liu Li;Wang An-Kang;Wen Qiao-Yan
在高安全级别的通信中采用隐蔽通信方法。谈到量子通信，隐蔽性也是Arrazola和Scarani首先讨论的一个重要问题（Phys Rev Lett, 117:250503, 2016）。为了使量子密钥分发（QKD）协议更适用于对安全性要求较高的场景，本文提出了一种基于诱饵状态方法的隐蔽QKD协议。证明了隐蔽诱饵态QKD的安全密钥速率和隐蔽性。在数值模拟中，我们将隐蔽诱饵态QKD与原始诱饵态QKD和无诱饵态隐蔽QKD的性能进行了比较。结果表明：(1)隐蔽诱饵态QKD除了具有隐蔽性外，还具有与原诱饵态QKD协议相当的性能；(2)隐蔽诱饵态QKD传输距离比不带诱饵态的隐蔽QKD传输距离大，但隐蔽参数变化很小。此外，基于高斯分析的方法还考虑了由于数据长度有限而产生的统计波动。
Covert communication methods are used in the communication with high security level. When it turns to quantum communication, covertness is also an important concern which is firstly discussed by Arrazola and Scarani (Phys Rev Lett, 117:250503, 2016). To make quantum key distribution (QKD) protocol more suitable in the scenarios need high security, we propose a covert QKD protocol with decoy-state method in this paper. The secure key rate and covertness of the covert decoy-state QKD are proved. We compare the performance of the covert decoy-state QKD with those of the original decoy-state QKD and covert QKD without decoy states in numerical simulations. It shows that (1) the covert decoy-state QKD can have a performance comparable to the original decoy-state QKD protocol besides its covertness; (2) the covert decoy-state QKD can have a considerable improvement of transmission distance over covert QKD without decoy states at the cost of a small change of covertness parameter. Furthermore, the statistical fluctuation due to the finite length of data is also taken into account based on the Gaussian analysis method.